China responded to Ukrainian President Volodymyr Zelenskiy’s claim that at least 155 Chinese nationals are fighting alongside Russian troops, with a Foreign Ministry spokesman advising against “irresponsible remarks” and reiterating China’s desire for a peaceful resolution.
Saying “those are just mercenaries, we didn’t send them” would have also been a perfectly fine response by China. But then I suppose that would be admitting that there are Chinese people that the CCP can’t control.